Dust flux, Vostok ice core

Dust flux, Vostok ice core
Two dimensional phase space reconstruction of dust flux from the Vostok core over the period 186-4 ka using the time derivative method. Dust flux on the x-axis, rate of change is on the y-axis. From Gipp (2001).

Wednesday, February 5, 2020

The colour is blue at the Aga Khan Museum

The Aga Khan is the head of a small, but wealthy, subset of Shia Islam.

He is known for charitable works around the world. Today's topic is about one of these, the Aga Khan Museum in Toronto. I had decided to visit late last year when I became aware of an exhibit based on trade in West Africa during the Medieval Era. I had been interested in this topic since the company I worked for at the time drew on the history of gold caravans in West Africa for promotional reasons back when it first began working in the area. During field work in different parts of Ghana, we discovered traces of the historical economic development of the region, some of which has been described previously.

I also took a tour of the museum, which detailed many of the architectural details which might otherwise go unappreciated. For instance, the theme of the museum was light, and the dominant colour for the exterior walls was to be white. Normally this would mean marble, but it was rejected because a study had shown that marble broke down too quickly for a building which is meant to last for hundreds of years. Instead, a white granite was located from a quarry in South America


White granite exterior walls, guaranteed to last

In keeping with the theme of light, most of the interior of the museum is bathed in light from various windows. Elaborate patterned shutters on the windows throw an ever-changing series of patterned shadows across the interior walls of the building as the day proceeds.


Pattern on most of the windows. Material is cast zinc


A Persian symbol for nothingness

Symbology is important in the museum. Apart from the above symbol for nothingess (as everything was created out of nothing, there must be a little bit of "nothing" in everything), there are hexagonal and more complex repeating motifs in the windows and vents, and even the drain in the centre of the courtyard.

Blue seems to be another common theme in the museum. Especially lapis.


The Dancer. A mosaic of lapis


Hexagonal staircase to the auditorium. Terrazzo from Italy


Looking straight up the centre of the spiral stair



Bar made from matching slabs of lapis


The auditorium. It's actually bluer than this


The dome of the auditorium


Shutter for the Bellerive Room in the museum

The principal symmetry element for the interior is a 1 m x 1 m square. All of the major features in the building line  up with the edge of the squares, or else with 2 m x 2 m squares. All of the double doorways are 2 m across, and the edge of the doorway lines up with the edges of the floor tiles (which are 1 m x 1 m). Even the tiling in the courtyard lines up with the outer edges of 2 m x 2 m squares (the straight segments in the tiles below)



Stone floor of the central courtyard, composed of the same white 
granite as the exterior walls, pink limestone from France, and 
blue lapis


A look at the surrounding grounds (the dark squares are reflecting 
pools in the summer) and the Ismaili Centre.


Nearby, the Toronto skyline says "Hello" 

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